The Romanian National Teams are from the European country of Romania.
Team member Niko Nenad was responsible for the Attack of the Killer Forest during Quidditch World Cup 1809 final match (Pm).
While Romania has been in the final of the 1809 Quidditch World Cup, their Wikipedia page has no Quidditch teams or any other wizarding sports listed (Wikipedia).
From the Web
Writing by J.K. Rowling on Pottermore:
Pottermore enhanced reading experience: Quidditch World Cup
Screenshots of the original Daily Prophet coverage of the 2014 Quidditch World Cup on Pottermore: Imgur archive
Harry Potter Wiki: Romania National Quidditch Team
Tags: forest international match Quidditch history teams trees